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[FAQ] TIDA-01081: How does TMP116 reduce MCU pin occupation and enable automatic LED-module detection in LED lighting control systems for machine vision

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Part Number: TIDA-01081

How does TMP116 (±0.2°C accurate digital temperature sensor) reduce MCU pin occupation and enable automatic LED-module detection in LED lighting control systems for machine vision as shown in reference design TIDA-01081?

  • TIDA-01081 is a TI Reference Design that demonstrates a unique approach to drive and control a string of multiple high-power LEDs targeted for industrial machine vision systems. The design allows users to program LED current and timing to enable the safe overdriving of LEDs for increased brightness. It makes LED currents up to 2.4 A and on times as low as 200 ns possible enabling very fast photo acquisition in machine vision.

    TMP116 is a low-power, high-precision temperature sensor with integrated EEPROM memory. It provides an accuracy of up to ±0.2°C with no calibration. The TMP116 is I2C- and SMBus-interface compatible, has programmable alert functionality, and can support up to four devices on a single bus.

    TIDA-01081 takes advantage of TMP116s I2C bus connectivity. This allows connecting 4 sensors for measuring critical temperatures in various locations on the board while occupying only two MCU pins. An integrated alert output enables the temperature sensors to notify the MCU about over temperature without occupying its processing power.

    TIDA-01081 is designed to be modular with temperature sensors distributed throughout the modules. The EEPROM included in TMP116s allow the storage of user defined data. This can enable identification and the storage of configuration and runtime information in a real application. On the LED module for example LED type, current and runtime can be stored, which enables the MCU to automatically detect which module is connected and what its history is.

    For additional information about this topic, please refer to section 2.4.2.3 "Temperature Sensing" of the User Guide for TIDA-01081.

    You can also download the design files (BOM, Schematic, Gerber) for this reference design from the TIDA-01081 folder.

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